Climate Control Issue - 2005 MKIII / L322

[Onyx Z32]

Hey guys, can anyone point me in the right direction? This is exactly what's happening to my Range Rover: Climate Control Problems Some owners have reported their air conditioning will work perfectly for about 1/2 an hour and then gradually the airflow will reduce so that the interior just gets hoter and hotter. Manually increasing the fan speed has no effect. The fan sounds as though it's working OK but there is very little air coming out of any of the vents. If you stop the car, turn off the ignition, wait a couple of minutes and start again then everything is OK. Dealers do not seem to recognize the problem. Similar problems have been reported on BMW 5 series vehicles that share the same system (see this link). Apparently in high humidity areas the control software turns off the A/C prematurely to prevent ice forming on the evaporator. For BMWs a service bulletin was issued on teh subject and there is a software fix; if you know of a fix for the Range Rover version please email me. From: MkIII L322 Range Rover Remedies Basically my compressor freezes up and I need to cycle the AC off (using the button) until the air blows strong again... and I need to do this every 20min or so in the summer to keep my air blowing! My local dealership is totally clueless and claims they can't update my software and have no idea what I'm talking about... I spoke to at Atlantic British who told me to get the promotion number from rangerovers.net and give that to the dealership... but I can't find one anywhere. And since the dealership is the only place with autologic, it's the only place I can go to solve this problem from what I'm told. Any help is appreciated!

[socalrovershop]

no software update for this vehicle module. my only guess would be to replace the actual climate control module wich is just the face itself with the buttons. we did run into this problem with the newer range rovers sports and lr4s where the recirc button actully shuts off on its own to keep the front windshield from fogging up. might wanna check operation of either pollution sensor or outside air temp sensor as well. havent really seen this problem on full size range rovers with your year though. try not putting your setting on automatic and make sure the selector under the vents is set all the way to either blue or red when you want to make it hot or cold because that actually plays a big part in your system

[Onyx Z32]

The recirc button stays on auto and seems to work fine.

I'll check the pollution sensor / outside air temp sensor before trying to replace the climate control module. Is this a fault I can find with a scan tool or should I just replace them to find out?

The problem occurs even in manual mode and the vent is all the way to blue. I haven't tried to move it to the red when the problem occurs because I want it cold, lol.